What is the third most common gas found in the air we breathe ________ ?
Correct answer: D. Argon
- A. Hydrogen
- B. Neon
- C. Carbondioxide
- D. Argon
Explanation
After nitrogen and oxygen, argon is the third most abundant gas in dry air, making up about 0.93%. Carbon dioxide is much less abundant and continues to vary with emissions and natural processes.
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Environmental science covers ecosystems, food chains and webs, energy flow, biogeochemical cycles, biodiversity, natural resources and population effects. Atmospheric study includes the layers and composition of air, weather and climate, greenhouse gases, global warming, ozone depletion, acid rain and pollution, with climate change distinguished from ordinary weather variation.
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